9301 Fast Preamplifier

The ORTEC Model 9301 low-noise, fast-rise-time Preamplifier has been designed for use with photomultipliers, electron multipliers, and other detectors employed in photon counting, ion counting, or fast-timing applications. When connected to the detector, the 50-Ω input resistance of the Model 9301 provides a load resistance for the detector output current pulse.

Literature
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More Info
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In addition to its fast rise time of 1.5 ns, this preamplifier has a voltage gain of 10 and an output impedance of 50 Ω. Because of its compact size and light weight, the Model 9301 is ideal for mounting directly or close to a detector. Consequently, low-level signals, which would otherwise be susceptible to pickup of noise or interference, are boosted to a suitable level for cable connection to the main amplifier. Connection to a power supply is through the 3-m (10-ft) long captive power cable furnished with the Model 9301.

Model 9301 is fitted with a power cable connector (Amphenol 17-20090) that is compatible with other ORTEC NIM-standard modules.

Specifications
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Performance

Noise

Noise

Typical

Guaranteed

0 pF

100 pF

295 rms electrons

450 rms electrons

<340 rms electrons

<485 rms electrons

Rise Time

Based on a +0.5 V signal through either output into a 93-Ω circuit and measured from 10% to 90% of peak amplitude; 25 ns at 0 pF and 150 ns at 100 pF.

Sensitivity

Nominal, measured through either output, 4 V/pC.

Dynamic Input Capacitance

1000 pF.

Integral Nonlinearity

≤±0.05% for 0 to ±7 V open circuit or ±3.5 V terminated in 93 Ω.

Output Linear Range

±7 V.

Temperature Instability

≤±50 ppm/°C, 0 to 50°C.

Detector Bias Isolations

±3000 V.

Open Loop Gain

≥40,000.

Inputs

Input

Accepts input signals from a proportional counter and extends operating bias to the proportional counter.

Bias

Accepts the bias voltage for the proportional counter from a bias supply.

Test

Accepts input voltage pulses from a pulse generator for instrument and system check and calibration; Rin = 93 Ω.

Outputs

Energy and Timing

2 connectors furnish identical signals through 2 output paths; either or both of these outputs can be used as required, and they are interchangeable. Ro = 93 Ω through each connector, and the output polarity is opposite from the input pulse polarity (output pulse polarity is the same as bias polarity).

Connectors

Input and Bias

SHV.

Test, Energy, and Timing

BNC.

Power Cable

3-m (10-ft) captive power cable. ORTEC 121-C1; longer lengths available on special order.